Single agent is "duplicated"

[rocketraman]

Since updating to version 0.8.5 I've seen a weird issue where TeamCity things one agent is actually 3:

That single agent is running a build:

And the other two agents are actually started and running, but showing as "Unauthorized":

Clicking the "Authorize button dose nothing apparently because my max agents is set to 3 and TeamCity thinks 3 are already running.

Stopping two of the "fake" agents manually seems to fix it:

After doing that and waiting for the current build to complete, TC starts 2 actually new agents:

But one of the ones that was started before shows now in idle status and does not pick up any new builds, so this one has to be stopped manually as well.

[rocketraman]

I had a warning in TeamCity that the agents had out of date plugins. I wonder if the GCP plugin version being different on the agent vs the server was the cause of the issue. I updated the agent image and so far the problem seems to have gone away.